linux-kernel - Re: [PATCH] usb: ehci-msm: Don't ioremap configuration space exclusively

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Message-ID: <1429170139.26621.3.camel@linaro.org>
Date:	Thu, 16 Apr 2015 10:42:19 +0300
From:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
To:	Vivek Gautam <gautamvivek1987@...il.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Vivek Gautam <gautam.vivek@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] usb: ehci-msm: Don't ioremap configuration space
 exclusively


Hi,

On Wed, 2015-04-15 at 21:28 +0530, Vivek Gautam wrote:
> On Thu, Apr 9, 2015 at 8:19 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> > On Thu, 9 Apr 2015, Ivan T. Ivanov wrote:
> > 
> > > This allow same IO space to be shared between HCD and Device
> > > controller driver. Which can be loaded simultaneously and
> > > started/stopped on demand by USB OTG PHY driver.
> 
> Are you sure ?

No.

> Will ehci controller registers overlap with the Device controller's register
> region ?
> 

Well, not exactly DC vs HC region, but at least USB_AHBBURST, USB_AHBMODE,
USB_USBMODE are used by both OTG phy-msm-usb and this ehci-msm driver. 
And this is broken right now. 

Ivan

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